The only trend I'm seeing is that they are open-sourcing stuff they don't care about anymore. E.g. I just tried OneDrive, which has a shitty implementation on OS X and no implementation on Linux. If OneDrive doesn't have a Linux client (or good OS X support), what chances do you think Edge has?
And forget about Linux - if extensions are going to get distributed through the Windows Store, as this article claims, you can say goodbye to OS X support as well.
And forget about Linux - if extensions are going to get distributed through the Windows Store, as this article claims, you can say goodbye to OS X support as well.